CBR engine noises

[TCFA]

Hi folks

I'd like to draw on your combined expertise re my CBR600F. 'tis a 2003 fuel injected model. Bought it privately with 21.5k on the clock. Experiencing concerning engine noises.

1) regular ticking sound, increases with revs. I thought this might be the cam chain. However, when I took it in to get the front disc changed (warped, boo), I asked the mechanics about it and they said it is not a noise to be concerned about. So I'm happy on that.

2) the engine sounds coarse above around 5k. When I rode the bike home (through town so no high revving) I thought it just had a nice throaty airbox noise, not having much experience with a sports IL4. But it just doesn't sound right. I then thought it was maybe loose plastics - I can't entirely rule this out, but I'm fairly certain it's the engine.

3) I experience a metal scraping / tinkling noise. I thought it was the key fob on the yoke, but sadly no. It comes on at 6000, then goes. It is an irregular sound, i.e. not with any rhythm. I hope that something which vibrates has a particular resonance at that frequency, but I've no idea what it could be. It sounds nasty though.

Any ideas?

Cheers and happy bank holiday
____________________
Then: Kawasaki ZZR250 > Suzuki Across 250 > Suzuki SV650 > Honda CB750
Now: Honda CBR600F and Triumph Tiger 800 XRT